Speaking as one who's first child came unplanned and after 15 years of marriage, the "before days" were like a really really close and loving monogamous relationship with legal contractual and religious obligations. I imagine this is what the gay community is clamoring for. If that's how society's gonna see marriage, then why not let them have it?
Nowadays, we still have all of the above, but there's a purpose to our marriage that goes beyond ourselves. There's a wide-eyed beautiful curious mischievous living legacy now... He sings in his crib at 3 AM, and sometimes it makes us cry with joy. If people feel like I'm p!ssing on their barbeque simply for pointing this out, so be it.
Speaking from experience, the childless can enjoy theme parks and video games as much as anybody... but there's always the knowledge that these things were designed and built with kids in mind, as was marriage.
You don't sound like a happy person to me. And that is really the point of being open to the creation of new life within marriage.
Married love is also faithful and exclusive of all other, and this until death. This is how husband and wife understood it on the day on which, fully aware of what they were doing, they freely vowed themselves to one another in marriage. Though this fidelity of husband and wife sometimes presents difficulties, no one has the right to assert that it is impossible; it is, on the contrary, always honorable and meritorious. The example of countless married couples proves not only that fidelity is in accord with the nature of marriage, but also that it is the source of profound and enduring happiness.Finally, this love is fecund. It is not confined wholly to the loving interchange of husband and wife; it also contrives to go beyond this to bring new life into being. "Marriage and conjugal love are by their nature ordained toward the procreation and education of children. Children are really the supreme gift of marriage and contribute in the highest degree to their parents' welfare."
Paul VI
Humanae Vitae